动词
中文翻译：衰退
同义词：
['fall', 'diminish', 'wane']
例句：
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1. The populationof the city has been decliningfor several years.
这个城市的人口已经连续几年在减少。
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2. The economy is expected todecline in the coming year.
预计明年经济将下降。
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3. The popularity of this product hasbeen declining recently.
这款产品的受欢迎程度最近一直在下降。